[SR-12103] latest master snapshots don't output the git SHA

[weissi]

Previous ID	SR-12103
Radar	rdar://problem/58999118
Original Reporter	@weissi
Type	Bug

Additional Detail from JIRA

Votes	0
Component/s	Project Infrastructure
Labels	Bug
Assignee	@compnerd
Priority	Medium

Watchers: @shahmishal

md5: 34006e5897293a43ec757bd7298f22ac

Issue Description:

Previously, the dev versions of Swift have always printed the repo's git SHA. For example:

$ docker run -it --rm swiftlang/swift:nightly-5.2-bionic swift -version
Swift version 5.2-dev (Swift 7c021027d3)
Target: x86_64-unknown-linux-gnu

but the latest master snapshots don't do that which makes it hard to find the corresponding commits.

$ docker run -it --rm swiftlang/swift:nightly-master-bionic swift -version
Swift version 5.2-dev
Target: x86_64-unknown-linux-gnu

See how it only says 5.2-dev and no git sha?

[beccadax]

@swift-ci create

[shahmishal]

This looks related to this PR - #29040

Also, this started happening after swift-DEVELOPMENT-SNAPSHOT-2020-01-08-a tag.

cc: @compnerd

[shahmishal]

Reverted the PR which introduce this bug, please verify the fix in next released toolchain.